[DeviceService] Add service tests for VibrationManager.

services/device/android/register_jni.cc

Index: services/device/android/register_jni.cc
diff --git a/services/device/android/register_jni.cc b/services/device/android/register_jni.cc
index 345a8699e79c2e501e797720985e6f9863839f3d..8c3c5a5e68d87f290fe6990f5c63b4eeb7d2e026 100644
--- a/services/device/android/register_jni.cc
+++ b/services/device/android/register_jni.cc
@@ -5,16 +5,33 @@
 #include "services/device/android/register_jni.h"
 
 #include "base/android/jni_android.h"
+#include "base/android/jni_registrar.h"
+#include "mojo/android/system/core_impl.h"
+#include "mojo/android/system/watcher_impl.h"
 #include "services/device/time_zone_monitor/android/time_zone_monitor_jni_registrar.h"
 
 namespace device {
 
+namespace {
+
+const base::android::RegistrationMethod kRegisteredMethods[] = {
+    {"CoreImpl", mojo::android::RegisterCoreImpl},
+    {"WatcherImpl", mojo::android::RegisterWatcherImpl},
+};
+
+}  // namespace
+
 bool EnsureJniRegistered() {
   static bool g_jni_init_done = false;
 
   if (!g_jni_init_done) {
     JNIEnv* env = base::android::AttachCurrentThread();
 
+    if (!RegisterNativeMethods(env, kRegisteredMethods,
+                               arraysize(kRegisteredMethods))) {
+      return false;
+    }
+
     if (!android::RegisterTimeZoneMonitorJni(env))
       return false;